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ISSUES
Nr. | Description | Priority | Solution | |
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1 | Switches - use other pcbs footprint size and/or change panel to toggle switch | 1 | ||
2 | BOM : LOG for Volume LFO and VP out gain | 3 | fixed | |
3 | missing mounting holes for pcbs | 2 | open | |
4 | LED driver needed for gate led | 2 | fixed | |
5 | leds polarity on pcb | 3 | fixed ? | |
6 | LFO speed inverted pot, left is fast on the prototype | 1 | Or use reveresed Poti | fixed |
7 | panel holes too big for potis | 1 | open | |
8 | powersupply design not allowed - | 2 | open - use a own PSU - Yamaha PA30 and resctifier, capactitors | |
9 | markers for voltage test points missing | 3 | open | |
10 | more clearly infos about matched trannys and resistors | 3 | ||
11 | envelope change too CEM3310 or digital | 1 | open | |
12 | capacitors are too close next to the power supply section on mainboard | 1 | fixed | |
13 | use bigger traces | 1 | open | |
14 | Gate signal bleed in LFO | 1 | Blocker | fixed |
15 | V/oct unstable - waveforms wobbling - | 1 | Blocker | fixed |
16 | Lfo led not working | 3 | fixed | |
17 | Holes in vcf board and VCO board to mount on metal spacers - for better mounting | 2 |
open | ||||
18 | Case doesn't fit with the panel | 1 | workaround possible | |
19 | ua726 | 1 | use normal matched pair trannys | |
20 | ssm2040 | 1 | use the new SSI 2040 !! | |
21 | ||||
22 | knobs ask Patrick_H | |||
23 | connector 2pin | 13x | JST XH2 | https://www.reichelt.de/jst-stiftleiste-gerade-1x2-polig-xh-jst-xh2p-st-p185073.html?search=jst+st |
24 | connector plug 2pin | 13 | JST plug | |
25 | pin connector | 26x for 2 pin 2x 3pin | JST | |
26 | connector 3pin | 2 | JST | |
27 | connector plug 3pin | 2 | JST | https://www.reichelt.de/jst-buchsengehaeuse-1x3-polig-xh-jst-xh3p-bu-p185086.html?search=JST+XH |
BOM: 11-2020
changes:
in crazy.p clone R135 ---> 68pF
in Crazy.p clone R207 ---> 22nF
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Panel Wiring 11-2020
Project schematics RSF Kobol Expander I Clone.pdf
please note the 3Pin Connectors are wrong in the Wiring guide !!
Ground is the middle pin on the 3Pole connectors.
for all jacks:
S is to be connected on TIP Pin (hot)
SW is the Tip Switch Pin (for grounding when no plug is in the jack inserted)
Switches
needed: 1x 2 rows with 3 pins (ON/OFF) power (DPST)
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mouser | ordered | ||
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power | MHS222K not avail. | 06-MHS22204 | https://www.kynix.com/Detail/176774/MHS222K.html |
4x normal | MHS122K apem | home stock | |
Nr | ||||
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Pots | 50€ thonk T18 shaft or round shaft- you need 2 center pots and 1-2 Log 100KB 2xx 100kA 100KB center detent for tune and vco2 beat optional for Freq. its up to you. look at crazy patroches pic and in the BOM | |||
jacks | 35€45€ | |||
resistors | 30 | |||
capacitors | 2,2MF | reichelt | 30€5euro | |
ICs: 3080, lm324, lmxxx | estimated 100€ | |||
trannys, Power reg. | 5 | |||
diodes | 12 | |||
switches mouser | 10-20 | |||
cable and headers | 520 | |||
SSM2050 | 2x | 480€ or ask me for a replacement VCA/ADSR PCB to use CEM3310/AS3310 | ||
heatsinks | cooler2x | 5 | ||
external Yamaha PA30 | 50€ | |||
SSM2040 | Ebay 50 or use new SSI2140 with adapter 10€ | |||
case | Buchla boat from SAMODULAR - cut the frame to make it fit 100€ | |||
ic sockets | 10-15€ | |||
Yamaha PA-20 powersupply | 40€ | |||
knobs tme | GWB19BK | |||
LEDS | 3x | red | ||
Calibration
- VCO: linearity = High Freq. compensation. = there's a 1Mega Resistor which is connect to the Trimmer - adjust the Trimmer as close to 0V (which is a OFFSET and affect the V/Oct calibration)
2. VCO 1V/Oct as normal with Guitar tuner method or Freq. Counter/DMM
Schematics:
ob_345da9_schemas-carte-kobol-expander-1.pdf
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Pin 2 to GND not shown - importend
Power switch mod ? not validated yet (02/2024)
Final Pictures:
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